Agree. It's Comprehensive (AKA Other than collision).
Read the policy to confirm but this is what most auto policies say:
"Collision" means the upset of "your covered
auto" or a "non-owned auto" or their impact
with another vehicle or object.
Loss caused by the following is considered
other than "collision":
1. Missiles or falling objects;
3. Theft or larceny;
4. Explosion or earthquake;
6. Hail, water or flood;
7. Malicious mischief or vandalism;
8. Riot or civil commotion;
9. Contact with bird or animal; or
10. Breakage of glass.
It is clearly not collision.
I suggest you go up the food chain of the claims department management and if that doesn't work, file a complaint with your state's insurance department.